81 lines
2.0 KiB
Ruby
Executable File
81 lines
2.0 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# This tool provides an easy way to see what opcodes are associated with
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# certain x86 instructions by making use of Metasm!
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#
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# This file is part of Metasm, the Ruby assembly manipulation suite
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# Copyright (C) 2007 Yoann GUILLOT
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#
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# Licence is LGPL, see LICENCE in the top-level directory
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$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
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require 'rex'
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require 'rex/ui'
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require 'metasm'
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class String
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@@cpu = Metasm::Ia32.new
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class << self
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def cpu() @@cpu end
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def cpu=(c) @@cpu=c end
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end
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# encodes the current string as a Shellcode, returns the resulting EncodedData
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def encode_edata
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s = Metasm::Shellcode.assemble @@cpu, self
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s.encoded
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end
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# encodes the current string as a Shellcode, returns the resulting binary String
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# outputs warnings on unresolved relocations
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def encode
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ed = encode_edata
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if not ed.reloc.empty?
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puts 'W: encoded string has unresolved relocations: ' + ed.reloc.map { |o, r| r.target.inspect }.join(', ')
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end
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ed.fill
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ed.data
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end
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# decodes the current string as a Shellcode, with specified base address
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# returns the resulting Disassembler
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def decode_blocks(base_addr=0, eip=base_addr)
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sc = Metasm::Shellcode.decode(self, @@cpu)
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sc.base_addr = base_addr
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sc.disassemble(eip)
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end
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# decodes the current string as a Shellcode, with specified base address
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# returns the asm source equivallent
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def decode(base_addr=0, eip=base_addr)
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decode_blocks(base_addr, eip).to_s
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end
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end
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# Start a pseudo shell and dispatch lines to be assembled and then
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# disassembled.
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shell = Rex::Ui::Text::PseudoShell.new("%bldmetasm%clr")
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puts 'type "exit" or "quit" to quit', 'use ";" or "\\n" for newline', ''
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shell.run { |l|
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l.gsub!(/(\r|\n)/, '')
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l.gsub!(/\\n/, "\n")
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l.gsub!(';', "\n")
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break if %w[quit exit].include? l.chomp
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next if l.strip.empty?
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begin
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l = l.encode
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puts '"' + l.unpack('C*').map { |c| '\\x%02x' % c }.join + '"'
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rescue Metasm::Exception => e
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puts "Error: #{e.class} #{e.message}"
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end
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}
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